The Association of Colorado Independent Schools (ACIS) is a non-profit organization dedicated to the continuous improvement of member schools by providing accreditation, professional development, and advocacy services. It is affiliated with the National Association of Independent Schools (NAIS).

The independent schools in ACIS operate primarily on tuition, charitable contributions, and endowment income, not on tax or church funds. That allows the leadership of each school to determine the nature and purpose of its educational program. Independent governance by a board of trustees keeps each school faithful to its mission and responsive to the community it serves.